#30894: Reverse OneToOneField relation: `prefetch_related` uses `related_name`
while `select_related` uses `related_query_name`
-------------------------------------+-------------------------------------
Reporter: Adam Sołtysik | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 2.2
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Carlton Gibson):
Hi Adam.
It looks to me as if this case is already covered by the test suite (and
works)...
We have a
[https://github.com/django/django/blob/af8dbbe0d5099ce09fc77abdf8a3fb8a4f4015d9/tests/select_related_onetoone/models.py#L97-L103
LinkedList model]:
{{{
class LinkedList(models.Model):
name = models.CharField(max_length=50)
previous_item = models.OneToOneField(
'self', models.CASCADE,
related_name='next_item',
blank=True, null=True,
)
}}}
This is using the `related_name` `'next_item'`.
Then
[https://github.com/django/django/blob/af8dbbe0d5099ce09fc77abdf8a3fb8a4f4015d9/tests/select_related_onetoone/tests.py#L209-L214
in the test case, we use that in `select_related`]:
{{{
def test_self_relation(self):
item1 = LinkedList.objects.create(name='item1')
LinkedList.objects.create(name='item2', previous_item=item1)
with self.assertNumQueries(1):
item1_db =
LinkedList.objects.select_related('next_item').get(name='item1')
self.assertEqual(item1_db.next_item.name, 'item2')
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/30894#comment:1>
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